The problem with using targetlasttarget is that it relies on you only changing targets once in combat. If you need to switch DPS, counterspell or any number of other reasons you might want to change targets your last target obviously changes which will mess up your poly.
A more reliable method is to set up a multi-step keymap, each step sending assist to a different mage and use the mages active target to poly. Then you can [@party1target] your frostbolts.
I've never had reason to check but I'm sure there'd be a way to set up a "FTL party# target" in ISBoxer that would allow you to dynamically swap which "party#target" is being used to actively target and send DPS keys to your other characters. I know this system exists for games like SWTOR that only have basic /follow and /assist macros.
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